光催化氧化分解空气挥发性有机污染物的研究

Photocatalytic oxidation of airborne VOCs on TiO_2

利用高压汞灯为光源 ,研究了空气中常见的苯、二甲苯、庚烷、甲醇、丙酮、乙醚、甲醛、三氯乙烯和四氯乙烯等挥发性有机污染物在二氧化钛 (TiO2 )催化下的光解反应 ,除甲醛外 ,在 5min内分解率可达 80 %以上。并讨论了TiO2

Titanium dioxide(TiO 2)was used to catalyze the photolysis of benzene, xylene, n\|heptane,methanol, acetone,ethylether,formaldehyde, trichloroethylene and perchloroethlene in air. The photolysis was carried out with a high pressure mercury lamp.The degradation rate of these VOCs was more than 80 percent in five minuts except formaldehyde. The effects of catalyst amount, different types of TiO 2 catalyst and density of UV on the degradation rate of the VOCs were also studied.